Mr. H. J. Carter on the Organization of Infusoria, 235 



they arc of an oblong shape (and therefore unniistakeable, if 

 nothing but a legion of this species pregnant with ovules be pre- 

 sent), they are found like the ovules of Sponyilla, viz. scattered 

 over the sides of the vessel, and evidently have, in like manner, 

 tlie power of locomotion in addition to that which both also pos- 

 sess of turning upon their long axis when otherwise stationary. 

 This, perhaps, may be partly effected by the external membrane 

 just mentioned. The pellucid central area in the oblong ovules 

 of E. viridis corresponds with the oblong shape of the capsule 

 (tig. 59) ; but beyond this, and the central granule, I have not 

 been able to follow their development out of the parent ; though, 

 from the number of young E. virides which present themselves 

 under the circumstances mentioned, it may reasonably be inferred 

 that they come from the ovules. The young Euylence, however, 

 being so rapid in their movements when once the eilium is 

 formed, it can hardly be expected that, except under a state of 

 incarceration, their development can be followed so satisfactorily 

 as that of the slow-moving lliiizopod. Instances do occur, how- 

 ever, where the ovules gain the eilium within the cell, and there 

 bound about, when fully developed, like the zoospores of Algae 

 within their spore-eapsules. In this w^ay I have seen them 

 moving rapidly within the effete transparent capsuled body of 

 E. viridis and in Crumenula texta, where the spiral fibre layer is 

 so strongly developed as to retain the form of the Euylena for a 

 long time after all the soft parts have perished. On these occa- 

 sions the embryos are perfectly colourless, with the exception of 

 a central point, which reflects a red tint ; and on one occasion, 

 while watching a litter in rapid motion within the capsuled body 

 of E. viridis, the capsule gave way, and they came out one after 

 another just as zoospores escape from the spore-capsule ; but 

 from their incessant and vigorous movement I was unable to fol- 

 low them long enough to make out anything more about them. 

 Kolliker also noticed in Emjlena " four to six embryos in one 

 individual, and entirely filling it, which at last, furnished with 

 their red points and cilia, broke through their parent, leaving it 

 an empty case*." The same kind of development of the ovule 

 probably takes place in all the Khizopoda as in Spongilla, and in 

 Astasia as in Euylena. I have seen young Astasia in the 

 effete body of an old one, but could not say that the latter was 

 the parent. 



To Stein's original and valuable observations on the develop- 

 ment of embryos, arising from the division of the nucleus in 

 Vorticella;, I have already alluded; and also to i\I. Jules Haime's 

 statements regarding the ovules which he saw in the bodies of 



* Quart. Journ. Microscop. !Sc. vol. i. p. ^1, 18.33. 



